Modular cube



FIG. 1 is a perspective view of the modular cube.

FIG. 2 is a front view of the modular cube.

FIG. 3 is a back view of the modular cube.

FIG. 4 is a side view of the modular cube; and,

FIG. 5 is a top view of the modular cube. 

The ornamental design for a modular cube, as shown and described. 